I also got a collection judgment from the judge at my hearing two week ago. W2S is right, though. Your XH will hide everything he owns, put assets in other people's name (most probably the OW), and in general make it difficult to collect.
Only 20% of these judgments are ever collected. The trick is to be among the 20% who DO collect.
In my case, my XH has relatives in another state who would be willing to hide assets for him -- so finding them would be next to impossible.
My strategy is to prove that XH lied in court about his assets. I have a friend who works for a title company who is helping me sort through XH's properties, and a repo man who is helping me run VINs on XH's vehicles. If I can prove that XH lied in court about his assets, then it's likely the judge will put him in jail with a cash bond in the amount of the back support that he owes me. I believe there is 30 days to get this evidence and make a motion for a new trial.
If all else fails, you could hire a professional collection agency but they usually take 50% of the assets collected.